pdf_ocr_ondevice 3.2.0

On-device OCR engine for dart_pdf_editor that adds a selectable, searchable text layer to scanned PDFs with a downloadable PP-OCR ONNX model.

Changelog

3.2.0

• Lockstep minor release to align with dart_pdf_editor 3.2.0. No public on-device OCR API changes since 3.1.1.

3.1.1

• Lockstep patch release to align with dart_pdf_editor 3.1.1. No public on-device OCR API changes since 3.1.0.

3.1.0

• Lockstep release to align with dart_pdf_editor 3.1.0. No public on-device OCR API changes since 3.0.0.

3.0.0

• Lockstep major release to align with dart_pdf_editor 3.0.0. No public on-device OCR API changes since 2.1.0.

2.1.0

• Version bump to align with dart_pdf_editor 2.1.0. No public on-device OCR API changes since 2.0.0.

2.0.0

• Version bump to align with dart_pdf_editor 2.0.0. No public on-device OCR API changes since 1.4.7.

1.4.7

• Version bump to align with dart_pdf_editor 1.4.7. No public on-device OCR API changes since 1.4.6.

1.4.6

• Version bump to align with dart_pdf_editor 1.4.6. No public on-device OCR API changes since 1.4.5.

1.4.5

• Version bump to align with dart_pdf_editor 1.4.5. No public on-device OCR API changes since 1.4.4.

1.4.4

• Version bump to align with dart_pdf_editor 1.4.4. No public on-device OCR API changes since 1.4.3.

1.4.3

• Version bump to align with dart_pdf_editor 1.4.3. No public on-device OCR API changes since 1.4.2.

1.4.2

• Version bump to align with dart_pdf_editor 1.4.2. No public on-device OCR API changes since 1.4.1.

1.4.1

• Run downloaded ONNX OCR models on a long-lived worker isolate by default. Page RGBA buffers transfer without a structured-message copy, and model loading, preprocessing, inference, and post-processing no longer block the UI isolate.

1.4.0

• Version bump to align with dart_pdf_editor 1.4.0. Runtime maintenance keeps the on-device OCR package compatible with the 1.4.0 editor/app release.

1.3.2

• Version bump to align with dart_pdf_editor 1.3.2. No API changes since 1.3.1.

1.3.1

• Version bump to align with dart_pdf_editor 1.3.1. No API changes since 1.2.3.

1.2.3

• Added PdfOcrDownloadCancelToken so hosts can wire a Cancel button to in-flight model downloads; cancellation removes partial files and throws PdfOcrModelDownloadCanceled.
• Expanded the README download example to display file/overall progress and show where to call cancel().
• Fix on-device OCR failing on Windows with a garbled "Load model from … File doesn't exist" error. The ONNX Runtime session is now created from the model bytes (OrtSession.fromBuffer) instead of a file path: on Windows the binding passed the path as a narrow UTF-8 string where ONNX Runtime expects a wide wchar_t*, mangling every path - even pure-ASCII ones - into CJK mojibake. This supersedes the 1.2.2 ASCII path-staging workaround, which could not help because the corruption happened regardless of the path's contents.

1.2.2

• Fix on-device OCR model path staging on Windows so the downloaded PP-OCR ONNX model resolves correctly.

1.2.1

• Add a package example and shorten the pubspec description for pub.dev scoring.

1.2.0

• Downloadable on-device OCR package for the DartPDF app, with model-manager integration and native-platform OCR engine wiring.
• Version bump to align with dart_pdf_editor 1.2.0.

0.1.0

• Initial release. On-device, downloadable OCR for dart_pdf_editor.
• PdfOcrModelManager downloads, caches (under the app-support directory), integrity-checks (SHA-256), and removes OCR model bundles, reporting progress as bytes arrive. Native platforms only (isSupported is false on the web).
• OnDeviceOcrEngine implements PdfOcrEngine, mapping a backend's pixel-space text lines into PDF user space. PdfEditor.applyOcr writes an invisible, selectable layer with no per-page network call.
• OnnxOcrModelRunner runs a PP-OCR detect+recognize pipeline on ONNX Runtime (det resize/normalize, DB box extraction, CRNN/CTC decode), all of the pre/post-processing in pure, unit-tested Dart.
• PdfOcrModels.ppOcrV5Mobile describes the recommended lightweight model; point its file URLs at a bundle you host (see the README).